Add unittests target to the binary distribution (issue #1632)

- Move all tests from the top-level directory to tests/.
- Move files shared by cefclient and unittests to tests/shared/.
- Add a fused (single header/source file) version of gtest in
  tests/gtest/ with associated CMake configuration.
- Test-only headers are now exposed in include/test/. Unit test
  targets must define UNIT_TEST in order to access them.
- Replace usage of USING_CEF_SHARED with WRAPPING_CEF_SHARED for
  clarity (only the libcef_dll_wrapper target should define it).
- Remove the RENAME_DIRECTORY CMake macro which is no longer used.
- Remove C++11 usage from unittests sources for compatibility with
  the binary distribution configuration.
- Windows: Fix build errors due to chrome_elf.dll and imm32.lib
  missing from the CMake configuration.

tests/shared/browser/geometry_util.cc

@@ -0,0 +1,33 @@
+// Copyright (c) 2015 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#include "tests/shared/browser/geometry_util.h"
+
+#include <cmath>
+
+namespace client {
+
+int LogicalToDevice(int value, float device_scale_factor) {
+  float scaled_val = static_cast<float>(value) * device_scale_factor;
+  return static_cast<int>(std::floor(scaled_val));
+}
+
+CefRect LogicalToDevice(const CefRect& value, float device_scale_factor) {
+  return CefRect(LogicalToDevice(value.x, device_scale_factor),
+                 LogicalToDevice(value.y, device_scale_factor),
+                 LogicalToDevice(value.width, device_scale_factor),
+                 LogicalToDevice(value.height, device_scale_factor));
+}
+
+int DeviceToLogical(int value, float device_scale_factor) {
+  float scaled_val = static_cast<float>(value) / device_scale_factor;
+  return static_cast<int>(std::floor(scaled_val));
+}
+
+void DeviceToLogical(CefMouseEvent& value, float device_scale_factor) {
+  value.x = DeviceToLogical(value.x, device_scale_factor);
+  value.y = DeviceToLogical(value.y, device_scale_factor);
+}
+
+}  // namespace client